Planooraph co



WIRE LOOPING DEVQCE FOR PIANO STRINGS.

APPLICATION FILED FEB. 24. I919.

1,3 10,791 Patented July 22, 1919.

2 SHEETSSHEET A.. COGOZ ZO.

WIRE LOOPING DEVICE FOR PIANO STRINGS.

APPLICATION FILED FEB. 24 1919.

Patented July 22, 1919.

2 SHEETS-SHEET 2.

1| H hi i :1 42 w A e 6 J D a M 17 Ha a MJ-wW/Q i zkenzrr UNITED STATESPATENT onnron.

ANTONIO coeozzo, on NEW YORK, N. Y., ASSIGNOR TO RUDOLPH o. KOCH, or NEWYORK, N. Y.

Specification of Letters Patent.

Patented July 22, 1919.

Application filed February 24, 1919. Serial No. 278,812.

To all whom it may concern:

Be it known that I, AN'roNIo Cooozzo, a subject of the King ofItaly,'having declared my intention of becoming a citizen of the UnitedStates, and a resident of the borough of Bronx, county of Bronx, cityand State of New York, have invented certain new and useful Improvementsin Wire- Looping Devices for Piano-Strings, &c., of which the followingis a specification.

My invention relates to means for twisting the ends of wires to formloops thereon, as in the manufacture of piano strings, and for analogouspurposes; and the object is to completely eliminate all waste of wireand simplify the manipulation thereof, while at the same time attainingan eflicacious and superior product.

The invention consists in the specific construction, combination andarrangement of parts described and claimed, distinctive fea tures beingthe provision of a socket in the platen block for the reception andretention of the otherwise free end of a wire durin the twistingoperation, and the provision 0 a hand lever by which pressure may beapplied to the wire in such manner that the twisting thereof iseffectually and conveniently controlled, all as hereinafter fully setforth.

In the accompanying drawings,

Figure 1, is what may be designated as a front elevation of my improvedwire clamp-- lng mechanism, turned back into Fig. 2, is an angles toFig. 1;

Fig. 3, is a top view of the parts as shown in Figs. 1 and 2;

Fig. 4, is a sectional detail taken plane of line 4-4, Fig. 2;

Fi 5, is a front view of the platen block, detac ed from its support; I

Fig. 6, is a transverse section taken plane of line 6-6, Fig. 5;

Fig. 7, is a top view of the platen block;

Fig. 8, is a si e elevation like unto Fig. 2, except that the pressurelever is raised into operative position and the crank handle moved toset the clamping jaw,this view also illustrating the operative positionof my improved clamping mechanism as related to the rotatable twistinghook and the pressure lever being inoperative position;

elevation taken at right upon upon

spindle;

Fig. 9, is a top view with the pressure lever retracted and broken awaythe better to show the position of the wire in the clamping mechanism,and the shank twist imparted to the wire;

Fig. 10, is a detail of the platen block clamping jaw, and wire, withthe finishing coil imparted to the latter after the shank twist;

Fig. 11, is a detail view of a finished wire end;

Fig. 12, is a view showing the bent end of the wire before insertion inmy improved clamping mechanism;

Fig. 13, is a view of the end of the wire after the formation of theloop and the shank twist and prior to the finishing coil, imparted tothe extreme end of the wire that occupies the platen socket during theloop and shank twist;

Fig. 14, is a view of the looped end of a wire as twisted under the oldmethod, showing the waste of wire involved;

Fig. 15, is a rear mechanism on a smaller scale.

Heretofore, in the looping of piano strings, it has been customary todouble over the end of a wire upon itself for a length sufiicient toadmit of the insertion of both the strands (e, c, Fig. 14) of wire, thusformed, between the clamping jaws preparatory to the twistingoperations, thus necessitating the cutting off and discarding of thefree end (6) after the formation of the finishing coil In this oldmethod, after the clamping of both strands e, e, of the end of the wireand the rotation of the protuberant loop to form the shank twist 0 theend strand 6, was released from the clamping means, the main strand 6,reclamped, and the loop 6 again rotated to form the finishing andlocking coils e*,the free end 6, of the wire being meanwhile held tautby hand so as to afford the necessary tension. Obviously a suflicientlength of free end wire had to be provided to admit of a good fingerurchase thereon to enable the operator to so old the end of the wiretaut during the twisting of the securing coils e, as above stated. Afterthe formation of said securing coils the free loose end e, of the wirewas broken off as close as possible to said coils e, and discarded.

This old method obviously involved loss looped and view of the clampingin proportion to the value ofthe length of wire thus discarded, as wellas of the time and labor involved in unclampmg the strands, reclampingthe main strand, and

holding the end of the wire taut between the fingers during theformation of the securing coil 0*. c

I obviate these objectionable features by inserting only one, the main,strand e, of the wire between the clamping jaws, and by inserting theextremity 6*, of a shortened free end of wire in a socket 1?, formed forits reception in the platen block P,said free socket-extremity 6*,(Figs. 12 and 18) of the wire 6, being finally and fully utilized andincorporated in the finishing and fastening coil 6", as in Figs. 10 and11, during the formation of said coil 6, so that absolutely no waste ofmaterial is involved, and no trimming or breaking off operation isnecessary.

It will thus be seen that an essential feature of my invention, inconjunction with suitable clamping and twisting mechanism, is theformation of the platen block 1?, with the socket p, for the receptionand retention of the free end e ,,of the wire during the operation offorming the loop e and shanktwist 6 so that I do not confine myselfherein to the identical clamping and twisting mechanism herein shown byway of demonstrating the practical utility of my invention, it beingobvious that various modifications may be made in the configuration andconstruction of parts with like results, and without departing from thespirit and intent of my invention in this respect, which contemplatesbroadly means for holding laterally as related to the main strand theotherwise free end of the wire during the formation of the loop andshank twist, and then of the securing coils substantially as herein setforth.

With this qualification, it is to be understood that H, Fig. 8,represents the usual rotatable twisting hook and spindle employed inconjunction with the clamping means, all of a character and in a mannerwell known in the state of the art. B, is a base standard adapted to beclamped to a suitable stationary support positioned in proper relationto the rotatable twisting hook and spindle H. To this base standard B,is secured a back plate B, by means of bolts 6, b. Resting upon the topof the standard B, and secured tomthe back plate B, by screws 29, p, isthe platen block P. The hand control lever T, is fulcrumed on a bolt t,secured to an upper extension B, of the back plate B,the function of theshort or bearing arm t, of lever T, being to control the wire adjacentto the clamping jaw J, and hold the extremity 6*, in the socket p, inthe platen block P, until the shank twist 6 is completed, after whichthe pressure on the hand control lever T, is relaxed sufiiciently topermit the continued rotation of the twisting hook to draw the saidextremity e", from the socket p, and

wind it tightly around the main strand 6,

of the wire, forming the finishing and securing coils e*.

The socket p, is formed with a depth gage, to govern the extent ofprotrusion of wire thereinto, and various mechanical expedients may beresorted to for this purpose, that shown in the drawings (see moreparticularly Fig. 4) consisting of a set screw 19 the inner end of whichconstitutes the bottom of the socket p. It will be noted in thisconnection that the socket p, is positioned substantially at rightangles to the position of the main strand of: wire when clamped inposition; and that the adjacent face of the platen is countersunk orrecessed to accommodate said strand 6, (as at 10 and to also accommodate(as at 10,- Figs. 6 and 7) the securing coils 6 as formed at thetermination of the twisting operation.

The clamping jaw J, is fulcrumed on the base standard B, by means of thebolt 3'. The upper portion of the clamping jaw J, is held in alinementby a guard plate G, screwed to the back plate B, and by the head of abolt j; the jaw J, being slotted as at y' (Fig. 15) to straddle saidbolt 1', so as to admit of the movement of the jaw J, which movement iseffected by means of the crank handle C, actuating a spindle c, theinner end of which is screw threaded for engagement with the nut N.

I herein designate the hand leverT, as a control lever because itsfunction is to control the formation of the convolutions ofthe otherwisefree end 0, of the wire during the formation of the shank twist c andthe locking coils e, as herein set forth.

What I claim as my invention and desire to secure by Letters Patentis: 1. In wire looping mechanism of the character designated, thecombination with a rotatable spindle and twisting hook, of means forclamping the main strand of a wire, a platen formed with a socket forthe reception and retention of the otherwise free lateral extremity ofthe bent end of the wire, and means for applying pressure to saidlateral extremity of the wire during twisting operations, for thepurpose described.

2. In wire looping mechanism of the character designated, thecombination with a rotatable spindle and twisting hook, of means forclasping the main strand of a wire, a platen formed with means for theretention of the otherwise free lateral 'extremity of the bent end ofthe wire, and means for applying pressureto said lateral extremity ofthe wire during twisting operations, for the purpose described.

3. In wire looping mechanism of the character designated, thecombination with a rotatable spindle and twisting hook, of means forclamping a main strand of wire, a platen formed with a socket laterallypositioned as related to the prescribed position of said main strand ofwire and adapted to receive the otherwise free extremity of the bent endof the wire, and means adapted to control by pressure said lateralextremity of the wire during the twisting operations, for the purposedescribed.

4. In wire loopin mechanism of the character designated, the combinationwith a rotatable spindle and twisting hook, of means for clamping a mainstrand of wire, a platen formed with a socket laterally positioned asrelated to the prescribed position of said main strand of wire andadapted to receive the otherwise free extremity of the bent end of thewire, means for regulatcopiel of this patent may be obtained for fivecents each, by addressing the Commissioner ing the depth of said socket,and means adapted to control by pressure said lateral extremity of thewire during the twisting operations, for the purpose described.

5. In wire looping mechanism of the character designated, thecombination with a rotatable spindle and twisting hook, of

means for clamping a main strand of wire, a platen formed wlth a socketlaterally positioned as related to the prescribed position of said mainstrand of wire and adapted to receive the otherwise free extremity ofthe bent end of the wire, and a hand lever adapted to control bypressure applied thereto said lateral extremity of the wire during thetwisting operations, for the purpose set forth.

ANTONIO COGOZZO. Witnesses:

EMH. H. Dm'rz, MILTON I. MASSON.

of Patents,

Washington, D. 0."

